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【单选题】
由两块玻璃片(n1＝1.75)所形成的空气劈形膜，其一端厚度为零，另一端厚度为0.002cm。现用波长为 700nm 的单色平行光，垂直入射在膜的上表面，则形成的干涉条纹数目为A.
57
B.
58
C.
59
D.
56
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【单选题】The exercises are extremely difficult, but half of the class_____ them ahead of time. [ ]
A.
has already finished
B.
will finish
C.
have already finished
D.
finishes
【单选题】听力原文：Don't you think we need more time to complete this report? (A) Because it's already late. (B) Not really, we're almost done. (C) Tomorrow, if you like. (31)
A.
B.
【判断题】A facial expression or a gesture is a quick way of helping Ss to activate rules they alread y know.
A.
正确
B.
错误
【简答题】A．Because cannabis proved to be more harmful than tobacco. B．Because cannabis is already so widespread. C．Because it is not known whether cannabis may be harmful or not. D．Because cannabis is proved t...
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